METRO SYSTEMS ARE A MODERN METROPOLIS'S STATUS SYMBOL
Around the world 144 million people ride underground trains every day.But the concept of the underground train leaves little room for national variation: Colour schemes and announcments allow cities to project just a small fragment of their identity.
The photos were exposed for exactly the time it took the train to pass by the lens. So every picture shows an entire train.
LONDON. Opened in 1863. Overall network length: 408 km.